containing chlorine. the widespread smoke shut down a major highway and passaic's mayor told residents to close their windows. the government is offering to send four at-home covid-19 tests per residential address starting next week. it will take 7 to 12 days for the tests to arrive once ordered online. now back to "dateline." now back to "dateline." welcome back to "dateline." i'm natalie morales. investigators have a person of interest in the murder of 21-year-old robin hoynes, william marshall. but marshall has an alibi and there isn't enough evidence to bring charges against him. a break in the case would come, but not for another 20 years. here again, keith morrison with "the night before halloween." october 1985, another halloween.